Fuel Filler Neck Flap Missing?

Hi,

I have had my GP for about a month now. I just happened to notice as I was putting gas in it the last time that the little metal disk that you usually have to push the pump nozzel through is not there.

Do these cars come with one? And should I be worried that this thing is floating around my gas tank?

Thanks

I should mention this is an 07 GP